/Engine/Source/Runtime/GeometryFramework/Public/Components/BaseDynamicMeshComponent.h
Override rendering material support. If an Override material is set, then it will be used during drawing of all mesh buffers except Secondary buffers. Set an active override render material. This should replace all materials during rendering.
virtual void SetOverrideRenderMaterial ( [UMaterialInterface](API\Runtime\Engine\Materials\UMaterialInterface) * Material )